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Unit operation 1

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Unit operation 1

  1. 1. Shree dhanvantary pharmacy college Subject: unit operation
  2. 2. SIGMA BLADE MIXER PRINCIPLE The mechanism of mixing is shearing. The inter meshing of sigma shaped blades creates high creates shear and kneading actions.
  3. 3. CONSTRUCTION
  4. 4. EXPLAIN It consists of double trough shaped stationary bowl. Two sigma shaped blades are fitted horizontally in each trough of the bowl. These are connected to a fixed speed drive. The mixer is loaded from of the top and unloaded by tilting the entire bowl by means of a rack and pinion drive.
  5. 5. WORKING  Different powders are introduced from the top of the trough.  The body is covered because considerable dust may be involved during dry blending and granulating solution may evaporate during wet granulation.  Through the fixed speed drive, the sigma blades are allowed to rotate.  The blade move at different speeds.
  6. 6. USES, ADVANTAGES AND DISADVANTAGES 1. Sigma blade mixer is commonly used for mixing of dough ingredients in the baking industry. 2. It is primary used for liquid – solid mixing, and solid - solid mixing.  Sigma blade mixer creates a minimum dead space during mixing.  Sigma blade mixer works at a fixed speed.

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